Sprint has announced the Sprint 3G/4G USB U301 dual mode USB key that has both WiMAX and EVDO Rev. A support. More info:

The fastest speeds in 4G markets, 3G speeds everywhere else. Sprint 3G/4G USB U301 is the second dual-mode 3G/4G USB device available from Sprint. This small, easy-to-use device is compatible with both PC and Mac computers, connecting laptops or netbooks to the fastest wireless connection available. The dual-mode U301 provides access to Sprint 4G wireless speeds up to 10 times faster than 3G and access to the most dependable 3G mobile broadband network virtually everywhere else.

U301 is ideally suited for business customers looking to improve productivity, increase customer satisfaction and reduce costs or for consumers who want to browse the Web, send and receive email, access information and explore social networking and multimedia entertainment. With 4G speeds, users can stream HD videos, upload and download massive files in just seconds or download a song in several seconds or a movie in less than an hour.